Improvement in tucking attachments for sewing-machines



2Sheets--Sheetl. H. C. SCHMIDT. f

Tucking Attachment for Swing-'M'achne l mi Fig.

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I a l f5 WITIEESSYES. INVENTUR.

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TukingAttachment for Sewing-Machine.- "No. 129,987.

P'atented1u|y3 0,1872.

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` INVENTOR.

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-Tivrrnn STATES ATE FFGE.

`I EIllINRIC/H CHRISTIAN SCHMIDT, OF BIELEFELD, ASSIGNORgTO HEINRICH YPOLLAGK, OF HAMBURG, GERMANY.

l f i IMPROVEMENTIN TUCKING `ATTACHMENTS FOR SEWING-MACHINES.

y n Specification forming part of Letters Iatent No. 129,357, dated July30, 1872.

Specification describing a Tucking Apparat-us for Sewin g-Machines,invented by HEIN-V RICH CHRISTIAN SCHMIDT, of the city of Bielefeld,inthe Empire of Germany.

I "lhis apparatus is primarlly Intended and `adapted for use inmanufacturing establishments for tuclring, with superior accuracy,

` guiding devices of peculiar arrangement second, in a rotary crush forcreasing the fabric over the folder; third, in a seam-smoother forrubbing down the folds at the seams preparatory to iiattening the tucksupon the fabric; fourth, in'a seam-stretcher designed to preventpuckering; fth, in a retractible bow holding a pressing-roll forpressing the folded and sewed tucks, and assisting the feed and guides;sixth, in a double-acting feed-bar driving and assisting the saidpressing-roll; 'seventh,`in a presser-spring acting upon the retraetiblebow, all as hereinafter more fully` described. l

In the drawing, Figurellis a plan. View of the apparatus applied to thetable of a sewingmachine. Fig. 2 is a side elevation thereof, partly insection. Fig.,3 is a front elevation thereof. Fig. 4 is aperspectiveview of the feeding mechanism. a represents the spacing-guide, and b thefolding-blade,"iixed, respectively, to bars a and b,which bars areadjustable, by means of set-screws, in bearings a and b, secured to thetable. The folding-blade b is sufficiently thin. in front to allow thenarrowest tuck to be folded over it. Its position relatively to Jcheline A B, which coincides with the stitching-line of the sewing-machine,determines the width of the tucks, because the greater. the distanceofthe fore-edge b of the blade b in front of the line 'A'B the wider thetuck willbe. c is a blade on the cloth-plate of the sewing-machine,serving to guide the fabric straight on to theneedle. This guiding-blademay rest against or be supported by the ordinary cloth guide or gage.The bar c', to which it is attached, is pivoted at c, so that it may beturned baclrto facilitate the folding of the fabric over the blade, butis fixed by a springcatch, d, while in operation. The edges of theblades b and c must be precisely parallel with the stitching-line; anoblique position of blade c would produce irregularity inthe tuck. Thebars a and b are provided with scales to indicate accurately thedistances at which the edges of the blades may be set from thestitching-line A B. The zero of each scale coincides with thestitching-line, and by setting them according to the indications of the4scales the desired style of tucks can be accurately produced. The upperblade a is bent,

as represented in Fig. 2, and is made quite thin in front, as theneatness of the tucks depends upon this. lt serves to guide the fabricby the last seam so as to insure the parallelism of the tucks and togage the Vsamevas to -distance apart. To be able to arrange the fabricconveniently over the blades the ways or holders a and b, in which thebars a and b slide, are pivoted and furnished with slotted extensions,through which screws clamp the holders to an arm of the base-plate. Byloosening e both blades may be lifted; by loosening c blade ct. alonecan be lifted, leaving b in its place. By these means they areproperlyadjusted and secured. frepresents a cylindrical brush withspirally-arranged bristles, and furnished with a pulley. It is driventhrough a band from thecrankshaft of the machine at high speed, andserves to crease the fabric over the folding-blade b with a tendencyagainst the feed so as to smooth out the fabric and tightly draw thesame up to the edge 11". The end z of the shaftof the brush fconstitutes a spool-Winder.

represents a nger on the folding-blade b,

which serves to ilatten or smooth the folds at the seams against theedge of the spacer a. It is constructed with a feeler, g', by which itis set in proper position relatively to the edge of the spacer a, and isattached to the bar b of the folder b by a slide, g, and secured by aset-screw. The smoother/L' is in position when the feeler g' is at theedge of the spacer a. h represents a second finger, projecting downwardover the spacer a from the arm a in the form of a spring, and engaged bya. screw passing through the same. This linger is'constructed with adownward projection at the side of its point, locking into the spacer a,and serves to engage with the seams and to stretch the same. By turningthe screw the resistance of the spring and consequent pressure of thestretcher may be regulated. This will also assist in guiding the fabric.k represents a roll situated at the end of the bow r, which is pivotedAat t and t. This roll serves to feed and guide the fabric in unison witha doubleacting feed-bar, but primarily to press out the tucks atsuccessive operations, so as to perfectly smooth the same, each tuckpassing under the roll at least twice, the last time after having beenfinally folded and stretched. The roll receives its pressure from aspring, p, attached by hinge s and guided by s underneath the table.This spring is constructed with a roll, q, at its end, situated out ofthe center of pivots t and tf, and acting upon the fiat under side v ofsegment a of bow r. By turning the screw r passing through the table andacting upon the spring p the pressure of the roll It may be easilyregulated. In order to conveniently place the fabric or the ready foldedand sewed tucks under the presser-roll the bow 1' may be lifted byforcing back the push-rod l with knob o at end. The bow is steadied byplacing it, with catch m attached to the same, upon the support n. Itwill be held in a perpendicular position by lifting it higher until theroll q drops into the notch w of segment a. The feed-bar which drivesthe presser-roll projects in six rows of teeth over the sewingplate, andis situated under the roll of the width of the same, to assist iteffcctually in guiding and smoothing the tucks. This bar is hinged tothe ordinary feed-bar of the sewing-machine. Both bars have theirfulcrums on the same axis, and to effect a simultaneous lifting andfeeding a second eccentric is placed accordingly on the hook-spindle x.

The tucking operation as performed by this mechanism is as follows: Thefolder b having been properly adjusted for the desired width of tuck,and the spacer a with its edge at the stitching-line A B, the portionabove the tucks of the piece to be sewed is placed between the bars a.and b', and at the point for the highest tuck the fabric is placedbetween the folder b and the spacer a, the edge of the latter indicatingthe position of the seam. The outer portion of the fabric is then foldedback under the folder b, and between the same and the brush f. Thefabric thus prepared is fed forward by hand under the pressing-roll 7cand over the cloth-plate guide c, both of which have been retracted, anduntil its edge can be placed under the presser-foot of the machine,which can be accomplished readily and rapidly. The guide c and roll 7care then returned to position, the machine set in motion, and the rsttuck sewed, the several parts operating as already described. The tuckthus formed must be flattened down on the fabric. This is accomplishedin starting by hand. The spacer a. and its appurtenances, which now comeinto action, are properly adjusted back of the stitching-line and thesewed tuck folded over the spacer with its seam at the edgeof the sameand under the stretcher h. The fabric is then arranged as before for thenew tuck and the machine again started, when a tuck is gaged, folded,spaced, and guided by means of the blades et, b, and o, and the brushj', and sewed, and the preceding one flattened, stretched, and pressedby the fingers i and It, and the roll k, and the feed-bar, whichoperations are repeated until the desired number of tucks are completed.

Claims.

What I claim as my invention is l. The folding-blade b and spring-guideor spacer a, arranged in front of the sewing-machine, in combinationwith the folding extension guide c, adjustable with the folding-bladeand in line therewith, outhe cloth-plate, substantially as herein shownand described.

2. The rotary brush f, in combination with and for creasing the` fabricover the foldingblade b, substantially as set forth.

3. In the described combination with folding-blade b, spacer a, andcreaser f, I claim the seam-smoother i, constructed and arranged asrepresented, for the purpose specified.

4. The adjustable seam stretcher h, constructed, arranged, and operatingsubstantially as described, for the purpose stated.

5. The presser-roll K, mounted at end of the pivoted bow o', withsegment u, constructed and operating in unison with spring p and roll qsubstantially as shown and described.

6. The double-acting feed-bar, driving and assisting the saidpresser-roll, and constructed and arranged substantially as described.

7. The combination and arrangement of the folding and guiding blades a bc, creasingbrush f, seam-smoother z', seam-stretcher h, and presser-roll7c with double-acting feed-bar and sewing mechanism, substantially asherein shown a-nd described.

HEINRICH CHRISTIAN SCHMIDT.

Vitnesses:

WILHELM DNING, GorrLrnB BRINKMANN.

